Match the following species with the correct number of electrons present in them: Species Number of Electrons ( i ) Be 2 + ( a ) 0 ( ii ) H + ( b ) 10 ( iii ) Na + ( c ) 2 ( iv ) Mg + ( d ) 11 ( e ) 4

( i - c ) , ( i i - a ) , ( i i i - b ) , ( i v - d )

( i - d ) , ( i i - c ) , ( i i - b ) , ( i v - a )

( i - a ) , ( i i - b ) , ( i i i - c ) , ( i v - d )

( i - e ) , ( i i - d ) , ( i i - a ) , ( i v - c )

HARD

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The valency of sulphite ion is:

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What do you understand by a lone pair of electrons?

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Which of the following compounds contain(s) no covalent bond(s)?

KCl, {PH}_{3}, O_{2}, B_{2} H_{6}, H_{2} {SO}_{4}

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Give a reason for the following:

Ionic compounds have a high melting point.

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The compound having longest

C - Cl

bond is:

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Maximum bond angle at nitrogen is present in which of the following?

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Arrange the following compounds in increasing order of

C - O H

bond length: methanol, phenol,

p

-ethoxyphenol

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Total number of lone pair of electrons in

{I_{3}}^{-}

ion is:

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The intermolecular potential energy for the molecules

A

B

C

and

D

given below suggests that:
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The numbers of lone pair and bond pairs in hydrazine are, respectively:

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Among the following molecules, the one with the largest bond angle at the central atom is

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The number of

π

-bonds and

σ

-bonds present in naphthalene are respectively

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The metal ion with total number of electrons same as

S^{2 -}

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Which of the following pair contains

2

lone pair of electrons on the central atom?

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

In ozone molecule, the formal charge on the central oxygen atom is

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The correct order of

C - O

bond length is:

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Two elements $A$ and $B$ have electronegativities $1.2$ and $3.0$ respectively. The nature of bond between $A$ and $B$ would be

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The compound that has the largest

H - M - H

bond angle

(M = N, O, S, C)

, is :

HARD

Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The lattice energies of

NaCl, NaF, KCl

and

RbCl

follow the order

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The compound(s) with two lone pairs of electrons on the central atom is (are)

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Match the following species with the correct number of electrons present in them:

Species	Number of Electrons
$(i) {Be}^{2 +}$	$(a) 0$
$(ii) H^{+}$	$(b) 10$
$(iii) {Na}^{+}$	$(c) 2$
$(iv) {Mg}^{+}$	$(d) 11$
	$(e) 4$

The valency of sulphite ion is:

Important Questions on Atoms and Molecules

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